Tube handling device



E. HETT.

TUBE HANDLING DEVICE.

Patented Nov. 2|, I899.

(Application filed Jan. 3, 1899. H

9 Sheets-8haet I.

No Model.)

- mvamon monuew no" WASHINGTON n r No. 637,583. Patented Nov. 2|, I899.

E. HETT.

TUBE HANDLING DEVICE.

' (Application filed. Jan. 3, 1899.)

V\ W I I ATTORN Patented Nov. 2|, I899. E. HETT.

TUBE HANDLING DEVICE.

(Applicabion filed Jan. 3, 1899.)

9 Sheets-Sheet 3.

(No Model.)

INVENTOR ATTORNEY-I WITNESSES:

rm: Noam: Penn: 0a, momumov. wuumefon. n. cy

No. 637,583. Patented Nov. 2|, I899.

E. HETT.

TUBE HANDLING DEVICE.

(Application filed Jan. 3, 1899) v 9 Sheets-8heei 4.

(No Model.)

INVENTOR m2 ncnms PETERS co. wo'ru-u'ruo.v WASHINQTON, uv n.

' No. 637,583. Patented Nov} 2|, I899;

- v v E. ma'r'r.

TUBE HANDLING DEVICE.

[Application filed Ian. 3, 1899.) (No Model.) 9 Sheets8heat 5.

III- 5 WITNESSES: INVENTOR Tn: N'unms PETERS ca, myo'ro-umo" wAsumaTom n. cy

- no. 637,583. Patented Nov. 2|, I899.

E. HETT.

TUBE HANDLING DEVICE.

(Application filed Inn. 3, 1899.)

(No Model.) 4 9 Sheets$heet a.

ATTORNEY THE Nonms PETERS 0a.. FHOTOAJTHQ, WASHINGTON, 0.1:.

No. 637,583. Patented Nov. 2|, 1899. E. HETT.

TUBE HANDLING DEVICE.

(Appfication flld Jan. 3, 1899.)

9 Sheets-Sheet 7.

(No Model.)

WITNESSES:

INVENTOR I /nfiZv W ATTORNEY J' THE mums PETERS 00., PHGTO-LXTMQ. wAsHmcroN. a c.

No. 637,583. Patented Nov. 2|, 1 99.

E.. HETT.

TUBE HANDLING DEVICE.

(Application filed Jan. 3, 1899.)

(No Model.) 9 Sheets-$heet 8.

WITNESSES: INVENTOR I i 7/ S S J" v44" BY ATTORNE J No. 637,583. Patented Nov. 2|, I899.

E. HETT.

TUBE HANDLING DEVICE.

(Application fllsd Jan. 3, isom- (No Model.) Sheet 9.

R I H n"""""" WITNESSES: INVENTOR QJZM BY mm W ATTQRNE J m: mums PLTERS co, PHOTO-LIYNO t-ubes,or surfaces of any kind or, supports I UNITED OFFICE.

EDWARD: r m, -01: YoRK, N; Y.

. TUos-HANoLine newer.

QFEQGIEICATIONjQrmingpert r; Letters s renihim-637,583, ass November '21, mos. Appliostlonfilcfl January 8, 1899; jflerisl n'o. "100,924. (No lnndel.)

T0 aZl whom it may concern:

Be itknown that I, EDWARD HETT', a citizen of the United States, and a resident of-Newf York, (New Dorp,) in thec'ounty of Richmond,

State of NewYork have in vented certain new and useful Improvements in Tobe-Handling Devices, of which the followingis c specificstion.

This invention has reference to printingand transfer presses, and particularly to do I vices forhandling printing-cylinders or printing tubes or surfaces in connection with suchpresses.

The invention has for its object the" rabid," rend y, and con venient hahdlingof such printing cylinders, tubes, or surfaces orsn ppo'rts therefor, particularly in connection with their introduction into and removslfrom operativeposition in the press.

herein shown and claimed.

ders, and the form-cylinders are more substantial, but hollow shells carried by shafts,"

the printing-tubes being removable from the form-cylinders end'the form-cylinders being removable from the shafts, although; ohvi ously it can be used with any printing and transfer presses in which printing cylinders,

therefor. are employed.

In the'aocompanying drawings, which-form a part hereof, and which show the preferred ent figures refer to corresponding pnrts,'Fig ure 1 is a side view of anapperatus embodyihg my invention. Fig.2 is an end view of the carriage for carrying the hoisting-arms with a. printing-tube, form-cylinder, and shaft in position preparatory to being-raised. Fig, 3 is a plan view of the carriage. Fig. 4 is a, vertical section on lines 4 4 oi Fig. 2, looking in the direction indioated'by the arrow. Figs. 5, 6, 7, and 8 show details of the hoisting mechanism. Fig. 9 isre rear elevation of a press embodying my invention, with the car riage, printing-tubes, and other parts, however, omitted, and showing the standard at The invention consists ofthe novel devices eight whee .10 have gear-teeth adapted to mesh with the the side for removing or inserting the printin'g'tubes, Fig. 10 is a; vertical transverse seot'ionthrough the rails, showing the electrioal connections with the carriage; and Fig. 11 is a. side elevstionof the same. Fig. 12is a vertical horizontal section through the mag netio clutch on shaft 15. Figs. 13, 14, 15, and 16 are views of a. modified form of my improved device, Fig. 13 being a plan, Fig. 14

svertical section on the lines 14 14, Fig. 13,

endF-lg.'15being a side view, and, Fig. 16a V rear view, of the same.

- Referring to the specific forms of apparatus shown in the drawin s, 1 indicates the frame of a, multicolor-print ug press capable of simultaneously printing fifteen different col- QiS-SlllfllgfOl instance, as is shown in my appllcstiomserially numbered 518,0l5, filed J uly 19,189-1-of which2 is the web, 3 the drum, and

ll=.4 .several printing tubes or surfaces in posi tion in the press. Each printing-tube hasin the usual wey its group of inking and dsmpening-devices, which may in. an yproper menner be swung out of the way of the printing"- tnbe,-form-cylinder,-and shaft, enabling the same to be moved outward radially from their mountings in the press. As these do wices, however, form no part of my invention they are not shown and will not be further described. In practice the. printing-tube in the multicolor-press in con ueeti on with which my improved devices are shown is a. thin hollow external shell carried by the form-cylinfiler, and the form-cylinderis s more substantial but hollow shell carried by a shaft, the printin g-tube beingrem oveble fro m. the form- 'oyllnd'er. v Secured to theeeiling 5 are supports-5 for the circular rails 6, the supports and rails being suiteblyfastened together, as by bolts, as shown;

7 7 are plates provided with gear-teeth and secured to the mils 6; r

7 8 is a carriage adapted tomove upon-mils 6 and provided with hoisting mechanism, as hereinafter described.

. 9 9 form the. framework of the carriage.

The can-in?) is provided with four axles and s 10 10. One set of these wheels toethof plates. 7. The eight wheels ofthe cnrjriage are flanged and snugly fit the flanges shaft upon which the motor is mounted.

of the rails 6 6 and enable the carriage 8 to grip the rails 6 6 so firmly and snugly that it will always present the hoisting-arms 29 radially toward the press in whatever position the carriage 8 may chance to been the rails 6, whereby the raising and lowering of the hoisting-arms 29 will always boa radial motion from or toward the center of the axis of the press in all positions of the carriage and irrespective of the weight carried by the hoisting-arms. Motion upon circular rails 6 6 is imparted to the carriage 8, and hoistingarms 29 are moved inward or outward by means of electric motor 11, actin g through the following-described mechanism: Electric motor 11 and commutator 12 may be of any usual construction and maybe supplied with current in the manner to be presently described or in any well-known manner.

13 is a gear-wheel mounted upon the Sallie meshes with the teeth of large gear-wheel 1-4,

which, together with gear-wheel 23, to which wheel it is fixedly secured, is loosely mounted upon-shaft 15.

16 is a beveled gear-wheel also mounted upon shaft and meshing with a similarlybeveled gear-wheel 1'7 upon worm-shaft 18.

' This latter shaft has a worm 19, which meshes with worm-wheel 20 upon shaft 21.

21 is the axle of carriage S, which carries the toothed wheels 10.

22 is a clutch for throwing shaft 15 intov connection with gearovheels 14 and 23, so as to cause the shaft to revolve with wheels 14 and 23. A clutch of any suitable kind may be employed for this purpose; but I prefer and have shown in the drawings a'magnetic clutch the construction and operation of which are as follows: The clutch 22 is composed of two parts, one part 22, secured to the shaft 15by feather and spline, so as to revolve with the shaft and be capable of slight longitudinal motion thereon, the other part 22 integral with'gear-wheels 14 and 23 and with them mounted loosely upon shaft 15. The parts 22 and 22 of the clutch are made of soft iron. Movable part 22 is wound with wire 22 in the usual wa and is provided with commutator 22 Wires'for carrying a current connect with the latter in any suitable way and the circuit is controlled in v When the circuit is closed, the two parts of the clutch will by frictional contact cause shaft 15 and bevel gear-wheel 16 to rotate'with gear-wheel 14,- thus driving carriage 8 along rails 6 into any desired position Gear-wheel 23 meshes with gear-wheel 24, mounted in hearings in the framework of carriage 8. Wheel 24 meshes with gear-wheel 25, loosely mounted upon shaft 26. Shaft 26 has at each end a beveled gear-wheel 28.

27 is a clutch which may be of any ordinary construction, for connecting gear wheel with shaft 26 to causethem torotate together. As preferred and as shown in the drawings,

shaft 26 to rotate with gear-wheel 25 whenthe circuit is closed and to remain at rest when the circuit is opened. The clutch and its parts will accordingly not be further described.

Beveled gear-wheels 28 mesh with beveled gear-wheels 38, mounted upon shafts 39 for the purpose of raising or lowering hoistingarm 29. This is done by means of the fol lowing-described mechanism.

29 29 29 29 are hoistingarms for raising or lowering the tube, form cylinders, and shaft. These hoisting-arms consist each of two parts 29 and 29, which are movable rela tively-upon each other. As shown, arm 29 moves up and down in grooves 29 in arms 29. Arms 29 move up and down in grooves 30 in the framework of carriage 8, as shown in Fig. 5. The entire hoisting-arms are thus adapted to move up and down in grooves 30 of the carriage and at the same time parts 29 move up and down in grooves in parts 29". Arms 29 are forked at their lower end and carry movable spring-pressed supporting eccentrics 34, which furnish a secure and adj ustable seatv for the ends of the permanent shaft which supports the tubular form-cylinder. Fork 31 of arm 29 at theleft of the 4 press is composed of two parts 31 and 31*,

each part pivoted at its upper end and adapted to swing outward to permit the end of the shaft to be grasped and removed or to be inserted. These parts have overlapping collars 31, through which pins 32 are passed when ashaft is being held to lock the two parts together. 33 represents the'ends of the shaft.

35 is a right and left hand screw-shaft mounted loosely in bearings36 of arms 29.

37 is a gear-wheel upon screw-shaft 35. It meshes with gear-wheel 41 upon shaft 39, the latter being mounted in bearings 40 in the framework of carriage 8. Rotary motion is imparted to shaft 39 by means of beveled gear-wheel 38. Gear-wheel ll is adapted to move up and down upon shaft 39; but by shaft 35.

The rotary motion in one direction imparted to beveled gear 38 by beveled gear 28 causes shaft 39 and gear-wheel 41 to revolve. The

latter rotates gear-wheel 37 and with it screwshaft 35. As screw-shaft turns the stationary half of right-hand nut 44 forces screwshaft 35 and hoisting-arm 29" to rise, carrying up with them, by means of link 43, the gear-wheel 41. At the same time the left hand half-nut 38 forces arm 29 to rise relatively to screw-shaft 35 and arm 29. By this movement both parts of the hoisting-arms 29 29 29 29 and all their connections rise relatively to the framework of carriage 8; but arms 29 and their connections, including any printing-tube, form-cylinder, and shaft that they may be carrying, rise twice as fast as Fig. 6 represents the various parts in their lowest position, and Fig. 7 the position they assume whenthe upward movement is nearly completed.

By a reversal of the motor motion in the opposite direction is given (when clutch 27 is energized) to the various parts through shaft 26, beveled gear-wheels 28 and 38, and screwshaft 35, and thus arms 29 and 29 are lowered, arms 29 moving downward twice as rapidly as do arms 29%. By these means printing-tubes, form-cylinders, and shafts can be rapidly and easily removed and replaced. In a multicolor-press two movable carriages operated by two gangs of men can be employed, as shown in Fig. 5, and the work of removing the printing-tubes or form-cylinders from the press or of placing them in it can thus be further expedited. Quickness and despatch in doing such work is important in multicolor-presses. My improved device has also the advantage that it occupies a comparatively small space, andthis is generally an important item,especially with multicolorprinting presses. Another advantage is that by .my improved device a printing-tube cylinder can be removed from any part of the press.

In Figs. 10 and 11 is shown one method of making electrical connection with the motor on carriage 8. 50 is a strip of wood fastened to the side of each circular rail 6 and forming an insulated support for the electric conduotor 51, which is a metallic strip of copper running the entire length of the circular rails. 52 'is a shoe or brush adapted to slide upon strip 51 and secured upon the end of a springarm 52*, secured to bracket 55, the latter be ing bolted to framework 9 of carriage 8. 53 is an arm also secured to bracket 55 and carrying a set-screw 54, adapted to press upon spring-arm 52*, and thus regulate the pressure between shoe 52 and strip 51. Bracket 55 is electrically connected with electric motor 11 in any suitable manner 56 is a cord connected in any suitable manner to a lever or switch, (not shown,) so that the operator by turning the lever can separate shoe 52 from strip 51 or can bring them together. The shoes 52 upon opposite sides of the press and their connections and operating-levers are so arranged and are so connected with the dynamo that only one shoe shall be in contact with its copper strip at the same time and the current goes through the motor from one of the shoes in a direction the reverse of that from the other shoe.

Any means can be employed for securing the printing-tube, form-cylinder, or shaft to the hoistingarms and for inserting them therein or removing them therefrom-for instance, such as are shown in my applications known as Serial No. 552,641, filed June 13, 1895, and renewed July 12, 1898, Serial No. 685,764,'and Serial No. 578,841, filed February 11, 1896, and renewed July 12,1898, and Serial No. 685,766. I show in the drawings, however, and will now proceed to describe the form of apparatus which I prefer to use for this purpose.

45 is a receiving-shaft. It is mounted on a standard or frame 46 at the proper height to be exactly opposite permanent shaft 33, upon which the f0rm-cylinder and printing-tube are mounted when the shaft is in its raised position and so that when the two shafts are united end to end they will form one straight shaft. Receiving-shaft 45 is preferably pivotally mounted in standard 46, its mountings turning upon pivot 47, seated in the top of the.

standard. It also has suitable clutch mechanism 48, adapting it to' be firmly clutched to the permanent shaft 33 at one end of the same. In the drawings the receiving-shaft 45 is represented as carrying a printing-tube holder 49, snugly fitting receiving-shaft 45, so as to be readily slipped on and oif the same, and carrying two printing-tube holders 49, one near each end, adapted to receive and hold a printing-tube. The printing-tube holder is preferably made longer than the printing-tube, the extension at each end furnishing handles convenient for handling the whole when the printing-t ube is on it. Standard 46 may, if desired, be movable-as, forinstance, it may be mounted on a railway or upon wheels. Receiving-shaft 45 may be in any suitable way counterbalanced upon standard 46 and may be variably counterbalanced to meet varying conditions of load. Again,receiving-shaft 45 need not necessarily or in all cases be pivotally mounted, although I prefer that construction. It should be so mounted, however, as to be clutched with the permanent shaft 33 in one of the positions of the latter under the action of the hoisting apparatus and to be removable or unclutchable therefrom, according to the operation desired. If it were desired to remove a form-cylinder from the permanent shaft 33, the printingtube holder 49 would be slipped from receiving-shaft 45, the latter would be then coupled up with the permanent shaft, and the entire form-cylinder be slipped along the composite shaft 33 45 until it rested entirely on shaft 45. The operation of removing from .4 states hoisting-arms 29 radially toward the permanent shaft, pins 32 having been first withdrawn from left fork 31 and its two parts 31 and 31 having been swung apart. Forks 31 then grasp both ends of permanent shaft 33, the parts of the left fork are secured in position, electric motor 11 is reversed, and clutch 27 is energized, whereupon hoisting-arms 29 are radially raised, bringing up with them permanent shaft 33 and its form-cylinder and printing-tube. Clutch 22 is then energized, causing carriage S to move along rails 6 until permanent shaft 33 is opposite to and directly in line with receiving-shaft 45. These two shafts are then secured together bylocking device 48, the parts 31 and 31 of left fork 31 are swung apart, and the printing-tube is then slipped along the composite shaft 33 45 until it rests entirely upon printing-tube holder 49 upon receiving-shaft 45. The two shafts are then disconnected, receiving-shaft 45 is swung around, and the printingtube is then removed 11 pon tube-holder 49 from standard 46. The same steps, but in the reverse order, are pursued in placing a printing-tube in position upon the press. Two standards 46 can at the same time be employed upon the same press-for example, one at the front and the other at the rear of the same side of the press. Where solid printing-cylinders are used or the printing-surfaces are not hollow tubes or shells, the receiving-shafts are of course unnecessary, and any suitable means may be employed for bringing the printing cylinders or surfaces to or removing them from the carriage or the hoisting arms thereof, or they may be brought or removed by hand.

In Figs. 13, 14, 15, and 16 I have shown a slightly-modified form of myim proved device. I have found that in multicolor-presses where a great many printing-cylinders are used it is sometimes impossible to run the rails down far enough on the sides to enable the hoisting-arms of the carriage constructed as above described to reach the shafts of the printingcylinders in such part of the press. In such cases in order to enable the hoisting-arms to reach the shaft of the last printing-cylinder "from the middle of the carriage to one end have found it of advantage to interposev between gear-wheels 24 and 25 an additional gear-wheel 25, mounted upon the same shaft as that carrying gear-wheel 24, electric clutch 27 being interposed between gear 24 and gearwheel 25. As shown in Figs. 13 to 16, these two gear-Wheels and the clutch are mounted on the shaft which forms one of the axles'of the carriage. The gear-wheels 24 and 25 and the two parts of electric clutch 27 are all loosely mounted upon the axle. When electric clutch 27 is energized, all of these parts are locked together and all rotated together loosely upon the axle. The operation of the parts shown in Figs. 13 to 16, inclusive, is the same as that described for the mechanism of the other figures of the drawings. By the use of the worm 19 and worm-wheel 20 as a part of the connecting mechanism between the motor and the wheels of the carriage the carriage is securely locked in any position upon the rails where it may stop.

What I claim as new, and desire to secure by Letters Patent, is-- 1. In a press, hoisting-arms consisting of two parts movable upon each other, means for operating the hoisting-arms and means for moving the two parts thereof relatively to each other, whereby printing cylinders, tubes or surfaces or supports therefor may be placed in or be removed from, the press, substantially as set forth.

2. In a press, hoisting-arms consisting of two parts movable upon each other, means for operating the hoisting-arms, a screw-shaft carried by one of the movable parts and adapted to be rotated in either direction and a nut upon the other movable part engaging with said screw-shaft to cause the two parts of the hoisting-arms to move relatively to each other, whereby printing cylinders, tubes or surfaces or supports therefor may be placed in or removed from, the press, substantially as set forth.

3. In a press, hoisting-ar1ns, consisting of two parts movable upon each other, a right and left handed screw-shaft carried by one of the said parts and adapted to be rotated in either direction, a nut upon the framework of the carriage adapted to engage with said screw-shaft to raise or lower the hoisting-arms when the screw is rotated, a nut carried by the other part of the hoisting-arm, threaded oppositely to that of the said first nut, and

adapted also to engage with the said right and means for moving the carriage upon the rails, of hoisting-arms carried by the carriage and consisting of two parts movable upon each other and movable relatively to the carriage, means for operating the hoisting-arms and means for moving the two parts thereof relatively to the carriage and also relatively to each other, whereby printing cylinders, tubes or surfaces orsupports therefor may be placed in or be removed from, the press, substantially as set forth.

5. In a press, the combination with a carriage, rails upon which it is mounted and means for moving the carriage upon the rails, of hoisting-arms carried by the carriage and consisting of two parts movable upon each other, means for operating the hoisting-arms, a screw-shaft carried by one of the movable parts and adapted to be rotated in either direction, and a nut upon the other movable part engaging with said screw-shaft to cause the two parts of the hoisting-arms to be moved relatively to each other, whereby printing cylinders, tubes or surfaces or supports therefor may be placed in or be removed from, the.

press, substantially as set forth.

6. In a press, the combination with a carriage, rails upon which it is mounted and means for moving the carriage upon the rails, of hoisting-arms carried by the carriage and consisting of two parts movable upon each other, a right and left handed screw-shaft carried by one of the said parts and adapted to be rotated in either direction, a nut upon the framework of the carriage adapted to engage with said screw-shaft to raise or lower the hoisting-arms when the screw-shaft is rotated, a nut carried by the other part of the hoisting-arms, threaded oppositely to that of the said first nut and adapted to engage with the right and left handed screw-shaft to cause the said movable parts to be moved relatively to each other when the screw is rotated, and means for rotating the right and left handed screw in either direction, whereby printing cylinders, tubes or surfaces or supports therefor may be placed in or be removed from, the press, substantially as set forth.

7. In a press, the combination with a carriage, rails upon which it is mounted and means for moving the carriage upon the rails, of hoisting-arms, consisting of two part-s movable upon each other, a right and left handed screw-shaft mounted loos'ely in bearings in one of said parts and adapted to be rotated in either direction, a gear-wheel mounted upon said screw-shaft, another gear-wheel, meshing with said first-men tioned gear-wheel, loosely mounted on and securedby feather and spline to a shaft upon said carriage and adapted to turn with said shaft but movable lengthwise upon said shaft, links connecting said gear-wheels together whereby they are caused to move together, means for rotating said shaft in either direction, a right-handed nut secured to the carriage and adapted to act against the screw-shaft, whereby the latter will be raised or lowered when the screwshaft is rotated, a left-handed nut secured to the other of said movable parts of the hoisting-arms and adapted to act also against said screw-shaft, whereby the said two movable parts will be moved relatively to each other when the screw is rotated, substantially as set forth.

8. In a press, the combination with circular rails, having a rack, a carriage adapted to run thereon, an axle thereof provided with toothed wheels meshing with said rack, hoisting-arms and an electric motor for operating the carriage and hoisting-arms, of a train of gearing, connecting with a gear-wheel 011 the shaft of the motor, and a clutch adapted to transmit the motion of the motor to the said axle of the carriage, whereby the carriage maybe moved upon the circular rails to any.

desired position, and another train of gearing, connecting with the electric motor and a clutch adapted to transmit the motion of the electric motor to the hoisting-arms, whereby the latter may be raised or lowered, substantially as set forth.

9. In a press, the combination with circular rails having a rack and a carriage adapted to run thereon, an axle thereof provided with toothed wheels, hoisting-arms and an electric motor for operating the carriage and hoistingarms, of a train of gearing, connecting with a gear-wheel on the shaft of the motor, including a worm and worm-wheel, and a clutch adapted to transmit the motion of the motor to the said axle of the carriage, whereby the carriage may be moved upon the circular rails to any desired position, and another train of gearing, connecting with the electric motor and a clutch adapted to transmit the motion of the electric motor to the hoistingarms, whereby the latter may be raised or lowered, substantially as set forth.

10. In a press, the combination with circular rails, having a rack, a carriage adapted to run thereon, an axle thereof provided with toothed wheels meshing with said rack, an electric motor mounted upon the carriage to drive the latter along the rails, and connecting-gearing between the shaft of the motor and the said axle of the carriage, of a conductor consisting of a metallic strip running the length of the rails and insulated therefrom and connected electrically at one end with a source of electricity, a metallic shoe secured to the carriage and adapted to slide upon the metallic strip orto be removed therefrom, means for making or breaking contact between the shoeand the rail and electrical connection between the shoe and the electric motor, whereby a current may be supplied to the latter, substantially as set forth.

11. In a press, the combination with circular rails, having a rack, a carriage adapted to run thereon, an axle thereof provided with toothed wheels meshing with said rack, an electric motor mounted upon the carriage to drive the latter along the rails, and connecting-gearing between the shaft of the motor and the said axle of the carriage, of conductors, one for each rail, each consistingof a metallic strip running the length of therails and insulated therefrom and connected electrically at one end with asource of electricity, a metallic shoe upon each side of the carriage adapted to slide upon the metallic strip upon able carriage, rails upon which it is adapted to move, a motor, connecting mechanism between the motor and the wheels of the carriage adapted to impart motion to the carriage,

may be moved along the rails and will be locked in position wherever stopped, substantially as set forth.

13. A hoisting-arm for removing printing cylinders or tubes or supports therefor from a press or for inserting them therein, composed of two parts forming a fork pivoted to the arm and adapted, when unlocked from each other, to be swung outward to permit the removal of a printing cylinder, tube or support therefor from the hoisting-arm's, overlapping collars on said parts of the fork, and pins adapted to pass through the collars to lock the parts of the fork together, substantially as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

EDWARD HETT. Witnesses:

G. W. DONALDSON, EDWIN 

